The Bad: The center button is way too hard (must be forced to click) and very noisy. The base of the mouse (where the Logitech logo is) is too thin, the hand should curl to really keep the mouse and the position is unpleasant. The good: it is easy to control because quite heavy (two AA), by problems with the other 4 buttons, the siding hangs well and the mouse does not slip from the hands (rubber?). I do not recommend this mouse.